GMC 1500 gas to diesel conversion????

I have a 2008 GMC sierra 1500 reg cab 2wd with a 5.3 vortec, im really considering turning it into a diesel. Waht all do i need to make this happen? wat would be the cheapest, easiest, and best engine to put into it? id really like turning it into a 4wd along with it. What all parts do i need and what would be the cost? id really appreciate some professional advice, thanks

You need to buy another Truck...You'd need to make so many changes for that to work in a manner commensurate with the labor involved in doing it that -- unless that was THE Truck you first got laid in? -- it wouldn't be worth it!

Find one that's already a Diesel or -- especially if you live in a State that has Emmission Control Systems testing/verification, such as California -- buy a truck whos age puts it outside that regulatory jurisdiction and convert IT...and (unless you want to do something really small and "Diesel") "It" should be 4 W.D. to begin with and otherwise at LEAST a 3/4 ton rated vehicle.

People find that an interesting "Project", and are more likely to respond to your post(s).

FWIW that might get you an answer to your questions a bit quicker too... ; )
"Impossible" is only a degree of difficulty...set by the imagination for lack of motivation.